Another correction:it's also not so simple as to say we don't have reproductive systems, rather reproduction works different for Beings that live zillions of human years.

It appears your understanding of extra-terrestrial life, a.k.a. Angels is rather rudimentary and you mostly look for parallels with what you consider to be human counterparts. Humans only exist on this planet. Angels are good, whereas most human+Beings are evil, and the corresponding societies reflect this difference.